?
Solved

Detection of Windows Start bar

Posted on 2004-03-26
5
Medium Priority
?
268 Views
Last Modified: 2010-04-05
How can I detect if the Windows Start bar is visible or not. And how can I resize my Delphi Form to fit the screen, so that the Start bar doesn't cover the bottom of my form?

Joern
0
Comment
Question by:rainbowsoftware
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 11

Assisted Solution

by:shaneholmes
shaneholmes earned 300 total points
ID: 10687447
This was just posted by another expert


Set forms WindowsState property ro wsMaximized;

then in your onCreate event of the form, do this

Self.Width:= Screen.Width;
Self.Height:= Screen.Height;

If you dont want the border of your form, set the border style to bsNone

Shane
0
 
LVL 8

Assisted Solution

by:gmayo
gmayo earned 300 total points
ID: 10687479
Screen.WorkAreaHeight, if less than Screen.DesktopHeight, would give a rough indication of whether the taskbar is visible or not. Remember that some (weird!) people have their taskbar on the side, so you'd use the Width version instead.

Geoff M.
0
 
LVL 8

Expert Comment

by:gmayo
ID: 10687489
...which, of course, doesn't require you to set the form to maximised to test the size...
0
 
LVL 11

Expert Comment

by:shaneholmes
ID: 10687499
you can use this one to get a handle to the taskbar window:

var
 dw1 : dword;

dw1 := FindWindow('Shell_TrayWnd', '');

Now call GetWindowRect to ask the position and size of the window.

Shane
0
 
LVL 17

Accepted Solution

by:
geobul earned 400 total points
ID: 10689179
Hi,

Try this:

type
  TForm1 = class(TForm)
  private
    { Private declarations }
  protected
    procedure RequestAlign; override;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

uses ShellApi;

function GetTaskBar: TAppBarData;
var
  hTaskBar: HWND;
  abd: TAppBarData;
begin
  hTaskBar := FindWindow('Shell_TrayWnd', nil);

  if (hTaskBar <> 0) then begin
    abd.cbSize := sizeof(TAppBarData);
    abd.hWnd := hTaskBar;
    SHAppBarMessage(ABM_GETTASKBARPOS, abd);
  end;

  Result := abd;
end;

procedure TForm1.RequestAlign;
var
  rect: TRect;
  abd: TAppBarData;
begin
  // Get the current available work area
  SystemParametersInfo(SPI_GETWORKAREA, 0, @rect, 0);

  // Get the task bar info (rc indicates space required even if not showing)
  abd := GetTaskBar;

  // Subtract the rect
  SubtractRect(rect, rect, abd.rc);

  // Set this to be the new available work area
  SystemParametersInfo(SPI_SETWORKAREA, 0, @rect, 0);

  inherited RequestAlign;
end;

Now all maximized apps will use the available area only. It doesn't matter if the taskbar is currently visible.

Regards, Geo
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…
Have you created a query with information for a calendar? ... and then, abra-cadabra, the calendar is done?! I am going to show you how to make that happen. Visualize your data!  ... really see it To use the code to create a calendar from a q…
Suggested Courses
Course of the Month15 days, 8 hours left to enroll

741 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question